We study preheating following Higgs inflation in the Palatini formulation of gravity. numerically evolve perturbations radial mode field and that three scalars modeling gauge bosons. compare two non-perturbative mechanisms growth excitations -- parametric resonance tachyonic instability confirm latter plays dominant role. Our results provide further evidence happens within a single oscillation ...

Two recent scenarios of preheating-related baryogenesis are compared within the framework of Abelian Higgs model in (1+1) dimensions. It is shown that they shift baryon number in opposite directions. Once both scenarios can realize simultaneously as overlapped stages of the same physical process, even the sign of net generated asymmetry becomes dependent on initial parameters. As it was shown r...

We discuss the production of inflatino the superpartner of the inflaton due to vacuum fluctuations during preheating and argue that they do decay alongwith the inflaton to produce a thermal bath. Therefore they do not survive until nucleosynthsis to pose a threat to it. 1 presented the talk, based on the work in Ref. [13].

We study the semiclassical particle creation in the preheating phase after inflation. We work in the long-wavelength limit, in which all fields are considered homogeneous. The particle creation is shown to be intrinsically connected to the existence of chaos in the system. Typeset using REVTEX ∗Email address: [email protected] †Email address: [email protected] 1

Pair creation of strings in time-dependent backgrounds is studied from an effective field theory viewpoint, and some possible cosmological applications are discussed. Simple estimates suggest that excited strings may have played a significant role in preheating, if the string tension as measured in four-dimensional Einstein frame falls a couple of orders of magnitude below the four-dimensional ...